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Study of dose component discrimination method using micelle gel dosimeters for quality assurance in boron neutron
Ryosuke Narita1, Shin-Ichiro Hayashi2, Yoshinori Sakurai3
1Graduate School of Engineering, Kyoto University, Kyoto Daigaku-katsura, Nishikyo-ku, Kyoto, 615-8530, Japan.
Abstract:
As a new tool for quality assurance in boron neutron capture therapy, we focused on gel dosimeters that can estimate three-dimensional dose distribution. To establish a method that combines multiple types of radiochromic gel dosimeters sensitive to specific dose components for the discrimination of the dose components, the neutron and gamma-ray responses of leucocrystal violet micelle gel dosimeters were characterized. For the estimation of boron or nitrogen dose components, dosimeters containing boric acid or urea as a sensitizer were prepared, while for hydrogen dose components, light-water-based and heavy-water-based dosimeters were prepared. For investigating the neutron and gamma-ray response characteristics, the Heavy Water Neutron Irradiation Facility installed at the Kyoto University Reactor and the Co-60 gamma-ray irradiation facility were used. Based on the characterization results, a dose component discrimination method using four different types of gel dosimeter compositions was proposed.
